Install 7zip

install-7z.ps1

[System.Net.ServicePointManager]::SecurityProtocol = 'Tls,Tls11,Tls12';

function Test-Administrator
{
    $CurrentUser = New-Object Security.Principal.WindowsPrincipal([Security.Principal.WindowsIdentity]::GetCurrent())
    $CurrentUser.IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)
}

# Download file
function Get-File
{
    param(
        [Parameter(Mandatory)][string]$FileSource,
        [Parameter(Mandatory)][string]$FileDestination
    )
    Write-Host "`nDownloading to $($FileDestination)"
    Invoke-WebRequest -Uri $FileSource -UseBasicParsing -OutFile $FileDestination
    if (!(Test-Path $FileDestination)) {
        Write-Host "Downloading $FileDestination failed" -Foregroundcolor Red
        Exit
    } else {
        Write-Host "Download complete" -ForegroundColor Green
    }
}

# Install file
function Install-File
{
    param($InstallerSource)
    try {
        Write-Host "`nInstalling $InstallerSource"
        $proc = Start-Process -FilePath $InstallerSource -ArgumentList "/quiet /norestart" -Wait -PassThru
        $proc.waitForExit()
        Write-Host "Installation complete" -ForegroundColor Green
    } catch [expression] {
        Write-Host "Installation failed" -ForegroundColor Red
    }
}

# Check privileges
if (!(Test-Administrator)) {
    Write-Host "This script requires elevation (Run as Administrator)" -ForegroundColor Red
    Exit
}

$ZipSource      = 'https://www.7-zip.org/a/7z2409-x64.msi'
$ZipDestination = Join-Path $env:TEMP '7z2409-x64.msi'
Get-File $ZipSource $ZipDestination
Install-File $ZipDestination